Abstract: A standby power control apparatus is developed for monitoring the peripheral devices connected to a computer and the current computer status. A power-supply voltage applied to the peripheral devices and the computer can be completely blocked depending on the result of the monitoring. The standby power control apparatus is comprised of: a power-supply unit, interface unit, I/O terminal unit for transmitting the input signals received from a mouse or keyboard to the microprocessor, a switching unit, an individual load detector for detecting the load of a peripheral device, a sensor for determining the user status, a microprocessor for actuating the switching unit according to first to third input signals to control the voltage generated from the sockets, an individual drive signal generator for generating a drive signal to switch the switching unit; and a monitoring/management unit for transmitting a power-supply control command signal to the microprocessor, and providing the various administrator setup menus.